Former UKIP leader Nigel Farage is scrambling to distance himself from one of his former aides, who faces up to 20 years in a US prison after admitting that he had posed as a money launderer on the dark web to rip off drug smugglers.

George Cottrell, 22, who posed as “Bill” online, told a gang of drug traffickers that he could launder up to £122,000 a month for them through the internet with complete anonymity. However, unfortunately for him, the dealers actually turned out to be undercover FBI agents.

After the sting, Cottrell was arrested last July in Chicago as he was traveling back to London with Farage following the Republican National Convention in Ohio. He has been held behind bars in the US ever since.

On Tuesday, Farage tried to distance himself from Cottrell, telling ITV: “I can’t be responsible for what everyone around me does.”

Cottrell ran Farage’s private office and helped with media requests. Farage says he was not an employee and worked for UKIP as an unpaid volunteer.

Asked if he was disappointed in the former aide, Farage said he was “surprised” to hear of the allegations against Cottrell.

“He was 20 years old at the time this happened. [Do I feel] guilt? No guilt, [he had possibly] fallen into bad company – I’m not sure,” he said.

Court documents say Cottrell arranged for the agents to send him £15,500, which he intended to keep for himself. He then demanded £62,000 in bitcoin and threatened to alert authorities if they refused.

In his plea agreement, which has been seen by the Mirror, he admitted: “I falsely claimed that I would launder the criminal proceeds through my bank accounts for a fee.

“Rather than launder any of the money, though… I intended to retain the money.”

Cottrell was originally charged with 21 counts of fraud, money laundering, and extortion. After he plead not guilty to all of them, prosecutors agreed to drop all but one, wire fraud, in exchange for a guilty plea.